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As a biologist, a physicist, and a mathematician were riding on a trainmoving through the countryside, all see a brown cow. The biologist innocentlyremarks: “I see cows are brown.” The physicist corrects him: “That’s too broada generalization, you mean some cows are brown.” Finally, the mathematicianprovides the definitive analysis: “There exists at least one cow, one side ofwhich is brown.”